Ryan Ryan - 6 months ago 27
Swift Question

Simple Swift Stepper error

I am brand new to swift and am experimenting with things such as the stepper. I followed online step-by-step instructions on how to make one but I am getting an error (Attached below) and I am not quite understanding where the issue is. Thank you for the help!

Error:

2016-06-04 04:31:15.832 numChsnger[12025:1111078] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<numChsnger.ViewController 0x7fc082695990> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key stepper.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000102328d85 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001040ccdeb objc_exception_throw + 48
2 CoreFoundation 0x00000001023289c9 -[NSException raise] + 9
3 Foundation 0x00000001026fa19b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 288
4 UIKit 0x0000000102ce3d0c -[UIViewController setValue:forKey:] + 88
5 UIKit 0x0000000102f1a7fb -[UIRuntimeOutletConnection connect] + 109
6 CoreFoundation 0x0000000102262890 -[NSArray makeObjectsPerformSelector:] + 224
7 UIKit 0x0000000102f191de -[UINib instantiateWithOwner:options:] + 1864
8 UIKit 0x0000000102cea8d6 -[UIViewController _loadViewFromNibNamed:bundle:] + 381
9 UIKit 0x0000000102ceb202 -[UIViewController loadView] + 178
10 UIKit 0x0000000102ceb560 -[UIViewController loadViewIfRequired] + 138
11 UIKit 0x0000000102cebcd3 -[UIViewController view] + 27
12 UIKit 0x0000000102bc1fb4 -[UIWindow addRootViewControllerViewIfPossible] + 61
13 UIKit 0x0000000102bc269d -[UIWindow _setHidden:forced:] + 282
14 UIKit 0x0000000102bd4180 -[UIWindow makeKeyAndVisible] + 42
15 UIKit 0x0000000102b48ed9 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4131
16 UIKit 0x0000000102b4f568 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1769
17 UIKit 0x0000000102b4c714 -[UIApplication workspaceDidEndTransaction:] + 188
18 FrontBoardServices 0x0000000105f5d8c8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 24
19 FrontBoardServices 0x0000000105f5d741 -[FBSSerialQueue _performNext] + 178
20 FrontBoardServices 0x0000000105f5daca -[FBSSerialQueue _performNextFromRunLoopSource] + 45
21 CoreFoundation 0x000000010224e301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
22 CoreFoundation 0x000000010224422c __CFRunLoopDoSources0 + 556
23 CoreFoundation 0x00000001022436e3 __CFRunLoopRun + 867
24 CoreFoundation 0x00000001022430f8 CFRunLoopRunSpecific + 488
25 UIKit 0x0000000102b4bf21 -[UIApplication _run] + 402
26 UIKit 0x0000000102b50f09 UIApplicationMain + 171
27 numChsnger 0x0000000102144382 main + 114
28 libdyld.dylib 0x0000000104b9092d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException


View:

enter image description here

Answer

Check if your stepper has a redundant outlet in your storyboard. Right click on the stepper object in Storyboard and check if there is any outlet you don't want.

enter image description here

Also. Remove @Iboutlet var textV:UILabel! or reconnect it with the Label in your storyboard and the error will be gone.